Thursday

April 17, 2014

April 17, 2014

Total # Posts: 381

**physics**

An archer puts a 0.26-kg arrow to the bow-string. An average force of 200 N is exerted to draw the string back 1.4 m. (a) Assuming no frictional loss, with what speed does the arrow leave the bow? m/s (b) If the arrow is shot straight up, how high does it rise? m I got 47 for ...

**physics**

A 15.0-kg test rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1961 J by the time the rocket motor burns all the fuel. What additional height will the rocket rise? m - how do you organize this? how do the J's fit in?

**Physics**

A 4.00 103-kg car has a speed of 9 m/s. The car then hits a tree. The tree doesn't move and the car comes to rest. (a) Find the change in kinetic energy of the car. . J (b) Find the amount of work done in pushing in the front of the car. J (c) Find the size of the force th...

**Physics**

In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m. (a) Find the work done on the train. J (b) Find the change in kinetic energy. J (c) Find the final ki...

**Science**

If 5.6 mol of CuCl2 reacts with 10.2 mol of NaNo3, what is the limiting reagent?

**physics**

A charge of 3.0 nC and a charge of 5.8 nC are separated by 53.40 cm. Find the equilibrium position for a -4.7 nC charge.

**PLEASE COME LIST YOUR OPINIONS!**

On the contrary, time is flying, I gotta get going. I could be writing a masterpiece instead of complaining. I'm gonna make use of the time I have. Thanks for your support, Ms. Sue, it's been a pleasure talking to you. (:

**PLEASE COME LIST YOUR OPINIONS!**

Lol yeahh! But then I hand it in thinking it's an A+ and it turns out I get a B or something. You'd think I'd at least get an A- for effort...sigh.

**PLEASE COME LIST YOUR OPINIONS!**

I did realize that, Ms. Sue. I don't think my opinions are good enough so I was hoping a little bit of other people's opinions would help me brainstorm. But I guess I came to the wrong place for this. Excuse me.

**PLEASE COME LIST YOUR OPINIONS!**

I'm writing a poem and it requires me to list reasons on what you want your significant other to do to make you happy. SEEMS EASY ENOUGH, RIGHT? So I want to hear your thoughts on this particular topic :D

**chemistry**

yes it would-- don't doubt your answers even if the numbers seem odd lol

**chemistry**

Did you try to use the density formula D=m/v? Solve for m that way...

**Chemistry**

It is found that an unknown gas has a density of 2.5 times that of Oxygen gas of the same Temperature and Pressure. What is its molecular weight?

**Chemistry**

Suppose that 1.00 g of rubbing alcohol (C3H8O) evaporates from a 57.0g aluminum block If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol ...

**Chemistry**

How much heat (in Kj ) is required to warm 10.0g of ice, initially at -11.0 C, to steam at 112.0 C?

**chemistry**

How much heat (in Kj ) is required to warm 10.0g of ice, initially at -11.0 C, to steam at 112.0 C?

**chemistry**

which are ionic compounds? SO2 PCl3 NaBr PbO AlF3

**Chemistry**

A H2= (H1)(H3)/(H4)

**math**

please help simplify (3y/x^4)^-3 1/(1+square root of a) what would be the best solution: (1)/(x-2) +8= (x)/(x-2)

**Statistics**

Find the probability P(E or F) if E and F are mutually exclusive and P(E)=0.30 and P(F) =0.47

**Chemistry honors**

You have 2.657 x 10^2 mL of oxygen gas (O2) at 7.02 x 10^2 mm of Hg and 46 oC. What is the mass of the sample in milligrams?

**English**

Doing an assignment on act 4 scene 1-2 of Romeo and Juliet's symbols I have to use these symbols and find an object for each one that reflects it it needs evidence too Here are the symbols and thanks for all your help Love Foolishness of the feud Extremes Loyalty Dreams/F...

**math**

prove the identity : cos^4 theta- sin ^4 thetaover sin squared theta cos squared theta =cot squared theta - tan squared theta

**physics**

A batter hits a pop-up straight up over home plate at an initial velocity of 29 m/s. The ball is caught by the catcher at the same height that it was hit. At what velocity will the ball land in the catcher's mitt? none of these 29 m/s 14.5 m/s -14.5 m/s -29 m/s

**physics**

You are playing right field for the baseball team. Your team is up by one run in the bottom of the last inning of the game when a ground ball slips through the infield and comes straight toward you. As you pick up the ball 62 m from home plate, you see a runner rounding third ...

**physics**

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 42 m/s and at an angle of 33°. A cannonball that was accidentally dropped hits the moat below in 1.6 s. (a) How far from the castle wall does the cannonball hit t...

**physics**

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 25 m/s at an angle of 28° above the horizonta...

**physics**

A ball thrown horizontally at 27 m/s travels a horizontal distance of 51 m before hitting the ground. From what height was the ball thrown?

**7**

I got C

**Chemistry 101**

if 95j of heat is added to a pure gold coin with a mass of 16 grams, what is its temperature change? Specific heat capacity of gold is 0.128 j/g degrees C.

**math**

If 16 points are arranged in a circle, how many lines are needed to join every point at once?

**math**

If 16 points are arranged in a circle, how many lines are needed to join every point at once?

**college math**

Assume that there are 11 girls and 9 boys in the neighborhood club, and a team of 6 is to be selected. How many different teams can be selected if each team must contain exactly 3 girls and 3 boys?

**Chemistry 101**

A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.60g/cm cubed. What is the percent of copper and the percent of lead?

**math**

5 inches by 7 inches, and the box must be at least 4 inches tall. What is the least possible volume of a box, in cubic inches, that meets these requirements?

**chemistry**

If 6.57 g of iron are reacted with an excess of hydrochloric acid, HCI, then hydrogen gas and14.63 g of iron (III) chloride are obtained. calculate the theoretical yeild and percent of yeild of FeCl3.

**math**

what order are these fractions from least to greatest 1/7,1/9,2/7,1/12 2 5/6,9/8,3 1/8,3 1/9 5/9,10/3,2 1/4,3/2 11/2,4 1/2,1/100,5 1/4

**Algebra**

Thank You

**Algebra**

Given the function f(x)=2x²-7x+4,find f(10)=? *2x squared

**history**

General Grant's army came closest to defeat in the West as a result of a surprise Confederate attack at the Battle of A)vicksburg B)Fort henry C)Shiloh D)manassa

**Math 109**

Your cousin has just won the lottery and wants to create an account that will have $100,000 in 16 years to help pay for their child's college tuition. If the account has a fixed interest rate of 4.6% compounded 4 times each year, how much money should they put into the acc...

**chemistry**

#3 is the answer, CuO is the limiting reactant

**chemistry**

What is the wavelength of a 2500 kg truck traveling at a rate of 70 km/h?

**Physics**

An ideal gas is compressed at constant pressure to one-half its initial volume. If the pressure of the gas is 120 kPa, and 760 J of work is done on it, find the initial volume of the gas.

**social studies**

was the oldest of the three africian kingdoms?

**Pre calculus**

A window is made up of a circle embedded in a rectangle so that the diameter of the circle is a side of the rectangle. Find the demensions that will admit the most light if the perimeter ofthe window is 44 meters.

**Chem**

Seawater contains approximately 3.5% by mass and has a density of 1.02 g/mL. What volume of seawater contains 5.5g of sodium

**math**

how do you find the slant asymtote of f(x) = (x^3)/(x^2-1) ?

**Calculus**

What is the second derivative of (x^3)/(x^2-1)?

**Calc-please help!**

What is the second derivative of (x^3)/(x^2-1)? And how would I accurately graph both the derivative and the second derivative of this function?

**CHEM 112**

A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?

**CHEM 112**

A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?

**chemistry**

Suppose we want to charge a flask with 4.0 g of sugar. We put the empty flask on a balance and it is determined to weigh 190 g. Enter the weight we would expect to see on the balance when we're done adding the sugar.

**Math**

yes

**Math**

I am having a problem understanding my homework. use the grid to draw a rectangle, then complete the calculation 23 x17 Help thanks

**calculus**

using f'(x) as the limit of h approaches 0 [f(x+h)-f(x)]/h find: f'(x), given f(x)=|x|

**language arts**

sentence

**language arts**

verb is to ______ as zipcode is to address (unscramble) csteeenn

**Algebra 2**

what is .5 cubed?

**algebra 1 **

4+x/8=3/4

**math **

find the coordinates of the missing endpoint given that p is the midpoint of NQ N(5,4) P(6,3) Q(3,9) P(-1,5)

**algebra**

every inch on a model is equivalent to 3.5 feet on the real boat. what would be the mathmatical rule to express the relationship between the length of the model, m, and the length of the boat, b?

**Geometry**

Which equation can be used to find the unknow ange measures? The diagram is a triganle. A= x+30, B= 3x, and C = x-15 A 5x+15=90 B 5x+45-180 C 3x^3+15=180 D 5x+15=180 E 3x+30=180

**Chemistry**

A sample of gas occupies a volume of 500.0mL at .906 atm and 97 C. What will the final temperature (in Celsius) be if it is brought to a volume of 1.05L and a pressure of 502 mm Hg?

**physical science**

the moderate temperatures of islands throughout the world has much to do with waters: A. hgih evaporation rate. B. vast supply of thermal enerygy. C. poor conductivity D.high specific heat capacity.

**biology**

what is the scientific study of heredity

**science**

whats the breakdown of water to form two gases is the result of this process?

**Finance**

I need help computing the Annual percentage yield (APY) for a savings account that earned $56 in interest on $800 over 365 days? HELP PLEASE!

**Finance**

I need help computing the Annual percentage yield (APY) for a savings account that earned $56 in interest on $800 over 365 days? HELP PLEASE!

**Math**

Jake spent 3/8 of his money on a book and 1/2 of what was left on a magazine. He now has $6.25. How much money did he start with?

**science**

What is the current produced by a potential difference of 240 volts through a resistance of 0.2 ohms?

**social studies**

what forms part of the escarpment along the southern edge of the african continent

**English**

1. Neither (she, her) nor I will be at the assembly today. 2. To (whom, who) did you address that package? 3. Mrs Jamison and (he, him) were my favorite teachers last year. 4. (Who, Whom) remembered to bring a flashlight? 5. Did the club elect (her, she) president? 6. (He, Him...

**precalc**

What are parametric equations? How would you find the rectangular eq's when given parametric eq's? and how would you find parametric eq's when given rectangular eq's? for example, given x=cos4t and y=sin4t (t is between 0 and 2pi) what is the retangular equatio...

**precalc**

solve the system of equations: x^(2)+y^(2) = 12 xy = -4

**precalc**

Find the equation of the parabola: x^(2)+4x = y-8

**logarithms**

thanks

**logarithms**

Please help, im so confused. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

**logarithmic functions**

so the coefficient of a log function are the same as writing it as an exponent of x in the equation: log(subb)x = y ? therefore, Clog(subb)x = y is the same as log(subb)x^(C) = y ?

**logarithmic functions**

okay. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

**logarithmic functions**

How do you just know this though?

**logarithmic functions**

log(subscript 2)(0.5) I know how to convert it into: 0.5 = 2^(y) but then how do I find y?

**Chemistry**

Explain exactly how you would make 1 liter of a .10 M acetic acid solution using vinegar from the lab as the stock solution to be diluter.

**psychology**

in my psychology textbook this is called the bystander effect with the answer choices you have i would say diffusion responsibility, but i am not sure. It is definitely not A though.

**Excel**

Want to create a worksheet that will help track your grades and. What formulas and/or functions might you use?

**Math**

John bought 2 pounds of chocolate for $7.50. Write expression to find the cost of 3.5 pounds of chocolate?

**geometry**

345.6

**Early Childhood Education**

A child’s oral vocabulary is closely related to: A. his printing ability and scholarship. B. reading comprehension and ease in learning to read. C. creativity and motivation. D. attention span and distractibility. I think the answer is A

**physics**

A block of mass m = 2.00 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.20 kg which is at rest on a horizontal surface Determine the speeds of the two blocks after the collision. lighter block = heavier block = what wou...

**physics**

After a completely inelastic collision between two objects of equal mass, each having initial speed v, the two move off together with speed v/6. What was the angle between their initial directions? if this is the equation 2mvcos(theta)=2mv/6 what numbers would replace m and v?

**chemistry**

At pH 7.2, what is the ratio [HPO4 2-]/[H2PO4-]

**chemistry**

Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5

**math**

16_k=8 In the equation above, _ represents one of the operations of arithmetic: addition, subtraction, multiplication, or division. If k is a positive integer not equal to 8, what must be the value of k?

**Math**

What is the unit rate of 32 miles per hour?

**Math **

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

**Math **

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

**Math**

10 Jumps Thanks for all your help.

**Math**

a Frog is at the bottom of a 21 foot well. The frog jumps up 4 feet, and then falls back 2 feet. How many jumps will it take for the frong to jump out of the well?

**Math**

Thanks. Now I understand.

**Math**

After 7 jumps foward and 6 backward.

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